tidying an archway

Help !
we've just repapered the dining room in our 10 yr old house, which has
two arches. One of these is an original fixture, and it has proved a
right bu**er to trim the paper on the arch.
The other arch, which was a later addition by a previous owner, has
been 'lined' with what seems to be a thin strip of plastic just wider
than the arch with a quadrant beading on each side, which tidies the
whole thing up nicely
Does anybody know what it's called, how much it costs and where i can
get it from ?
(search of the NG finds mention of 'arch bead' but on screwfix, this
is the name they give to the metal stuff that goes under
plaster/skimming
all help gratefully received !!!
trev

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